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A. B. BROWN.

STEERING MACHINERY.

Patented Apr. 4, I899.

(Application filed Dec. 19,

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(No Model.)

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A. B. BROWN.

STEERING MACHINERY.

(Application filed Dec. 19, 1898.) (No Model.) 3 SheetsSheet 2.

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No. 622,600. Patented Apr. 4, I899. A. B. BROWN.

STEERING MACHINERY.

(Application filed Dec. 19, 1898.)

3 Sheets-$heet 3.

(No Model.)

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Nrrnn rarns ANDRElV BETTS BROIVN, OF EDINBURGH, SCOTLAND.

STEERING MACHINERY.

SPECIFICATION forming part of Letters I'atent No. 622,600, dated April4, 1899.

Application filed December 19,1898. Serial No. 699,744, (No model.)

To (LZZ whom it may concern.-

' Be itknown that I, ANDREW BETTS BROWN, a subject of the Queen of GreatBritain and Ireland, and a resident of Edinburgh, in the county oflllid-Lothian, Scotland, have invented certain Improvements in TelemotorApparatus for Steering Machinery, (for which I have applied for BritishPatent No. 12,232, dated May 31, 1898,) of which the following is aspecification.

My present invention comprises improve ments in the construction ofparts of telemetor apparatus for steering machinery and of the kinddescribed in the specifications of my United States Patents Nos. 568,736and 568,737, dated October 6, 1896, such apparatus having atransmitting-cylinder, which is at the bridge or steering-station and isconnected by pipes to a receiving or motor oylinder arranged to act onthe steering machinery.

My improvements are shown 011 three accompanying sheets of explanatorydrawings.

Figures 1 and 2 are front and side elevations of the transmittingapparatus. Fig. 3 is an enlarged section showing part of the trans-1nitting-cylinder. Fig. 1 is an elevation, and Fig. 5 a section, showingdifferential gearing through which the motion given to his hand-- wheelby the steersman is communicated to the other parts; Figs. (Sand 7 are asectional elevation and a vertical section of the receiving or motorcylinder.

In the drawings the same reference-letters are used to-mark the same orlike parts wherever they are repeated.

The transmitting part'of my improved apparatus comprises a longdouble-acting hydraulic cylinder A, having working in it a piston B, toone end of which is fixed a toothed rack or bar B. In Fig. 3 the pistonB is shown at the middle of its stroke, and at that part the cylinder Ais divided and a distancepiece A is inserted between the two cylinderparts, which are flanged for being bolted to the distance-piece A. Thelower part of the cylinder A is made longer than the upper partsufficiently to contain a length of rackbar 13 at least equal to thefull stroke of the piston 13. The distance-piece A is formed with spacesor passages A which when the piston 13 is in its middle position form. acommunication between the upper and lower parts of the cylinder A, so asto then equalize the pressures of the liquid in the two parts.

In gear with the rack'bar B there is a pinion O, fast on a shaft O,which extends out from the cylinder A through a stuffing-box C and hasfast on it, near its outer end, a pinion C The shaft O passes through atubular bearing 0*, which is in the same piece with a bracket or smallframe G fixed to the side of the cylinder A. On the tubular part O thereis fitted to rotate a cylindrical box D, which forms the central part ofthe steering hand-wheel D, a cover D fixed to the outer side of the box,having a central bearing D for the end of the shaft 0. The fixed tubularpart 0 has fixed on it a pinion O, which has gearing with it twodiametrically fixed across the box D, and each pinion D is in the samepiece with a pinion D which gears with the pinion 0 fast on the shaft0'. When the hand-Wheel D and with it the box D are turned, the pinionsD D are carried around and the pinions D are turned by their action onthe stationary pinion (3 their companion pinions'D acting on the pinionO 011 the shaft 0 and imparting to that shaft a rotatory motion having aratio to the motion of the handle-wheel D depending on the relativeproportions of the toothed gearing which has been described. With theproportions shown in the drawings the hand-wheel D shaft 0.

On the neck of the box D, where it bears on the fixed tubular part 0there is fixed a pinion E, which gears with a pinion E on a shortspindle carried by the bracket 0 and this spindle, by bevel-wheels Edrives a vertical spindle E which, by a worm and wormwheel E moves apointer E working over a scale E to show the position corresponding tothe extent of the movement imparted to the hand-wheel D.

The opposite ends of the transmitting-cylinder A are connected by pipesF G to the opposite ends of the receiving or motor cylinder H, Figs. 6and 7. There are also con necting-pipes A A to a bypass valve A, whichcan be used for equalizing the pressures in opposite ends of thecylinder by opposite planet-pinions D rotating on studs makes about fourturns for each turn of the hand at any time. There is also, as in myoriginal apparatus, provision for compensating difierences caused bychanges of temperature in the volume of the liquid in the pipes andcylinders, the distance-piece A between the two parts of the cylinder Abeing formed with a passage communicating with a valvebox J, connectedto a cistern. (Not shown.)

In the receiving apparatus, Figs. 6 and 7, the cylinder II is (like thetransmitting-cylinder A) constructed to have a double-acting piston Hworking toward one end of it, the other end being extended to inclose arackbar H fixed to one side of the piston. This rack-bar I-I gears witha pinion H which is fast on a shaft K, extending out through astuffing-box H The shaft K has on it a pinion K, which gears with arack-bar K having round end parts passing loosely through central holesin cross-heads K K and having washers and screw-nuts K K on theirextreme ends. The cross-heads K K are guided on rods L, fixed to theframe-pieces L L and tion compresses the springs M between thecross-heads, the outward movements of the cross heads being limited byadjustable screw-nuts L on the guide-rods L.

The rack-bar K has fixed to it a pin N, on which may be jointed a rodfor communicating the movement to the controlling-valve or other part ofthe steering-engines.

What I claim as my invention is- 1. In telemotor steering apparatushaving a transmitting-cylinder connected by pipes to a receiving ormotor cylinder, a transmitting-cylinder in one part of which works adouble-acting piston, the other part being elongated to inclose arack-bar fixed to one end of the piston, a pinion gearing with therack-bar and fast on a shaft extending out through a stuffing-box, andmeans to turn the shaft by a hand steering-wheel, substantially asherein set forth.

2. In telemotor steering apparatus having a transmitting-cylinder andreceiving-cyl inder and connecting-pipes, the combination of thetransmitting-cylinder and piston and rack-bar therein, with a shafthaving a pinion gearing into said rack-bar, a hand steering-wheel andintermediate differential planetary gearing between said wheel andshaft, substantially as and for the purpose described.

3. In telemotor steering apparatus, a receiving or motor cylinder, apiston and rack therein, and a shaft having a pinion gearing with saidrack and an external pinionin combination with an external rack-bargearing with said external pinion, two cross-heads through which theends of the rack-bar turn freely, nuts on the end of the rack-bar, fixedguidebars for the cross-heads, means for limiting the outward movementof the latter, and springs between the cross-heads, as and for thepurpose described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ANDREW' BETTS BROWN.

Witnesses:

PETER MOLEOD, J. D. McCULLocH.

